Abstract: A method of clock synchronization between first and second clocks on first and second ends, respectively, of an optical channel; and a system for clock synchronization between first and second clocks on first and second ends, respectively, of an optical channel.

Abstract: An optical range finding device and an optical range finding method. The method comprises the steps of generating light with a super Poissonian timing statistic; splitting the light into a reference beam and a probe beam and directing the probe beam towards a target in free-space; illuminating a first single-photon detector by the reference beam; illuminating a second single-photon detector by the probe beam after reflection by the target in free-space; detecting a time difference between detection of quantum-correlated photons in the reference beam and the reflected probe beam for determining a distance between the device and the target.

Abstract: A method and system for random number generation. The method comprises the steps of exposing first and second photodetectors to the same mode of a first electromagnetic field in the presence of a mode in a vacuum state of a second electromagnetic field, such that an illumination of the first and second photodetectors is at least substantially balanced; and generating a random noise signal based on a photocurrent difference between the first and second photodetectors.

Abstract: A method and system for random number generation. The method comprises the steps of exposing first and second photodetectors to the same mode of a first electromagnetic field in the presence of a mode in a vacuum state of a second electromagnetic field, such that an illumination of the first and second photodetectors is at least substantially balanced; and generating a random noise signal based on a photocurrent difference between the first and second photodetectors.

Abstract: The present invention relates to a quantum cryptography system for the secure key generation, especially with signal sources and analysis channels. The signal sources are arranged spatially separated in such a manner that the wave fronts of light signals emitted by them superimpose partially at the input of the quantum channel. The analysis channels are arranged in such a manner that the wave front of the light signals coming from the quantum channel are split up spatially and at least two of the parts are analyzed in a quantum mechanical state.

Abstract: The present invention relates to a quantum cryptography system for the secure key generation, especially with signal sources and analysis channels. The signal sources are arranged spatially separated in such a manner that the wave fronts of light signals emitted by them superimpose partially at the input of the quantum channel. The analysis channels are arranged in such a manner that the wave front of the light signals coming from the quantum channel are split up spatially and at least two of the parts are analyzed in a quantum mechanical condition.

Abstract: An avalanche-type detector circuit includes an avalanche-type photon detector device, a coupling capacitor, a bias network, a first transmission line and a second transmission line. The coupling capacitor has a first terminal that is coupled to a first terminal of the avalanche-type photon detector device. A first terminal of the bias network is coupled to the first terminal of the avalanche-type photon detector device, while a second terminal of the bias network is coupled to a bias voltage so that the avalanche-type photon detector device is reverse biased. A first end of the first transmission line is coupled to a second terminal of the coupling capacitor, and second end of the first transmission line is terminated by an open-circuit termination. A first end of the second transmission line is coupled to a second terminal of the avalanche-type photon detector device. The second end of the second transmission line is terminated by a short-circuit termination.